Carbureter.



W. F. SGHUL ZI,

GARBURETER.

APPLICATION 11,111) AUG. 21, 1911.

Patented Aug. 12, 1913.

QXMWMM I 1 im'rrnn strains PATENT eerie-n.

.WALTER F. SCHULZ, OE BROOKLYN YORK.

ARBURETE R.

I 1 '0 all whom it may concern:

Be it known that I. lVAL'rnn F. SCHULZ,

citizen of the United States, residing at Brooklyn. in the county of Kings and State of New York, have invented certain new and useful Improvements in Carburetors, of

which the following is a specification.

This invention comprehends certain new.

- tion has for its primary object an improved device of this character which will be sensitive, positive and accurate in its action, to properly proportion the air and gasolene or other hydrocarbon according to the speed of the engine, and which will be durable in constructions, arrangements and combinascribed.

. fully describe and claim.

construction, and not liable to get'out of orderand practically indifferent to wear.

lVith these and other objects in View as will more fully appear as the description proceeds, the invention consists in certain tions of the parts that I shall hereinafter For a full understanding ofthe invention, reference is to be had to the following description and accompanying drawings, in

which:

Figure 1 is a vertical sectional view of a carluu'eter. constructed in accord-tinge with my invention; Fig. 2 is an enlarged detail side elevation of a cylinder forming part of thedevice; and. Fig. 3 is a similar view of aplug, designed to be mounted in said 'cylinder-and hereinafter more specifically de- Correspoiuling and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters. N

The casing 1 of my improved carburetor is formed with the usual throttle contr'olled mixture passage 2 which communicates at one end with the interior of a vertically.

disposed cylinder 3 closed at its top-by a hollow piston 5. The piston 5 is formed with any desired number of ports 6 designed,

in one position of the piston, to register with ports 7 formed in the cylinder 3,,and the'piston is further provided with a rod 8 which extends down through the bottom wall of the casing 1 into a detachable cyl- Specification of Letters Patent. Patented A g, 121913. Application filed August 21,1911. Serial No. 645.233.

inder 9.'a suspension spring 10 being mount ed in the last named cylinder and connected to the. rod 8 and to the casing. so as to normally hold the piston 5 in closed position at the upper limit of its movement with the communication cut'ofi' between the ports (3 and 7. As is manifest. the ports 7 open to the atmosphere.

The piston rod 8 is operatively engaged by one end of a rocking arm or lever 11 which is fulcrumed intermediate of its ends in the casino 1 within the passage as at 12. the relatively short arm of said lever being connected to the upper end of a piston 13 in the form of a cylindrical tube open at both ends and throughout its length. The pistons 5 and 13 constitute the air admission valves of the carburetor. and for the purpose of distinction I shall hereinafter refer to the piston 5 as the second or auxiliary air admission valve. and the piston 13 as the main or primary 'air admission valve. although it is to be understood that this terminology is used only for the sake of clearness and that in reality the two valves .are coordinate. The piston 13 is longitudinally'movable within .an open ended cylindrical valve casing ltwhich is surrounded by an air admission chamber 15. the upper end of which communicates with atmospheric air by the port or ports 16 formed in a downward extension of the casing 1, said extension serving as the support for the float chamber 17. The chamber-1-7 communicatesiwith the interior of the valve casing 14 at the lower end of the latter, by means of any desired number of ports 18.-

The valve casing 14 is formed with one or more ports 19. said ports being preferably in the form of parallelograms disposed obliquely as shown, and being two in number in the present instance. When the auxiliary air admission valve or piston 13 is in the lowered position. it covers the ports 19. In carrying out my invention, having'particular reference to this important feature thereof, namely, the construction and are rangement of means for admitting the air and fuel "at this point into the 'carbureter and properly-mixing the same, I bore out the lower portion of the valve casing 14 up to the end of the lower longer sides of the parallelogram ports 19, and into this bore a plug tube 20flis inserted without changing the inner diameter of the main cylinder bore. The bottom of the plug 20 isclosed, and the outer surface of the plug is formed,.in that part of the exterior surface thereof which is in line with one or both of the parallelogram port-s20, with a The upper end of the plug 20 is slotted to conform to the lines of the illustrated in Fig. 3.

The construction and arrangement of the parts having been now described, I shall proceed to set. forth the operation thereof.

Normally,- the valves are in. closed position, and both move in unison. As soon as the piston, owing to the suction of the engine, moves toward open position, the air fuel admission valveor pistonlS performs two functions. It opens, to a greater or less extent the parallelogram ports 19 and exposes to the air rushing therethrough from the ports 16 and air admission chamber 15, more-and more of the vertical grooves 21 in the plug or tube 20. The superficial area of the grooves exposed is, as is obvious always in proportion to the degree of opening of the ports 19.

From the foregoing description in connecports 19, as best 7 tion with the accompanying drawing it will be'seen that I have provided a very simple and efficient construction of carbureter which will be durable and not liable to get out of order and which will be accurate and -indifi'erent to wear. There is no inspirator nozzle, as such, or needle valve to enact therewith and which is so liable to become worn and stick, or clogged up, and it is evi dent that by doing away with such elements and by providing parts which will subserve all of-the functions of such parts without their incidental disadvantages, I have made a distinct advance in the art and done away with the numerous difiicultics which have heretofore been experienced by all users of internal combustion engines and carbureters therefor, in the clogging of the needle valve and the consequent failure of the carburetor to feed the proper proportion of gaseous fuel and to mix the same propcrlywith the incoming -a1r.

Preferably the air valve 5 is axially movable to provide for adjustment, it being secured'by pins, as shown, to the axially movable screw cap .4. Hence, it will be understood that by turning the screw cap, the relation of the ports in the piston and the ports in the cylinder is changed, the arcs of the port openings being lengthened or short encd. In this Way, a variable movement of the, air valve can be obtained for a given quantit-yof air, and with this a variable lift .o fthe smallerfpiston that governsthe fuel esser? flow. The extremit of the lon er arm of the lever 11 is mounted on a spring-pressed pin 8* held within the stem 8 of the air what I believe to be the preferred. embodiment of my invention, it is to be understood that the invention is not limited thereto, but

that various changes .may'be made in the construction, arrangement and proportions of the parts without departing from the.

scope of the invention as defined in the appended claims.

Having thus described the invention what is claimed as new is 1. A carbureter comprisin-ga casing pro vided with a gasolene chamber, with a mixture outlet passage and an air inlet, a valve casing mounted in the main casing and communicating with the gasolene chamber and said passage and formed with a port communicating with the air inlet, and a mov-- able member mounted in said valve casing and operable to open and close said port to the interior of said movable. member and at the same time vary the feed of the gasoleue from the g solene chamber into said piston.

2. A carbureter, comprising a main casing provided with a gasolene chamber, with a mixture outlet and with an air inlet, an open valve casing mounted in the main casing and communicating at one end with the gasolene chamber and at its opposite end with the mixture outlet, an open-ended piston mounted in said valve casing, the latter being formed with a port exposed to the air inlet, and a plug tube mounted. in said valve casing and formed in its periphery with a plurality of longitudinal grooves leading'to said port.

3. A carbureter, comprising a main casing, provided with a gasolene chamber, with a mixture outlet and with an air inlet, a valve casing mounted in said main casing and formed with a port exposed to the air.

inlet, said valve casing communicating with the gasolene chamber and with the mixture outlet, an open. piston movable in said valve casing, and means in said valve casing formed with a plurality of fuel passages leading longitudinally to the port, said means otherwise cutting off the gasolene chamber portion of said valve casing from the portion thereof which is exposed to the mixture outlet, the piston being arranged to simultaneously open varying portions of said passages and said port.

4. A carbureter, comprising a casing provided with a gasolene chamber, with a mixture outlet and with an air inlet, an openended valve casing having one end in open communication with the gasol ene chamber and at its other end in open communication with the mixture outlet, said valve casing be ing formed intermediate of its ends with an obliquely disposed parallelogram port, a plug mounted in said valve easing intermediate of the ends thereof and formed with 'a plurality of longitudinally extending grooves leading from one end to theother t-hcreof,ithe plug be ng cut away to conform to said port, and an open-cnded piston op-' i of said valve casing, the main casing being formed with a mixture outlet communieating with the other end of said valve casing and with an air inlet, the valve casing being" formed with a port, a. plug mounted in said cylinder and formed in its exterior with a plurality of vertical grooves establishing communication between the two ends of the valve casing but otherwise cut ting off one end thereof from the other, an open'ended piston mounted to move in said valve casing to open and close the port thereof and expose more or less of said grooves belowthe lower end of said piston, and a spring actuated air valve movable in the main casing and arranged to admit air into the mixture outlet, and a connection between said valve and said piston.

6. A carburetor, comprisinga main casing cmbodying a valve casing mounted therein, the main casing being formed with a gasolenc chamber communicating with one end of said valve casing and with a mixture outlet communicating with the other end of said valve casing, the valve casing being formed with a port exposed to the atmosphere, a plug mounted in said valve casing and formed in itsexterior with a plurality of vertical grooves establishing communication between the two ends of said valve casing, 'an open-ended piston mounted to move in said valve casing to open and close the port thereof and to expose more or less of said grooves below the lower end of said piston, a spring controlled air valve mounted in the main casingand arranged to admit air into the mixture outlet,

anda lever fulcrumed in said main casing and pivotally connected at its opposite ends to said valveand said piston.

T. A carburetor comprising a main casing provided with a gasolene chamber, a mixture outlet passage, an air admission chamber open to the atmosphere and with air admission ports distinct from said chamber, a valve casing mounted in said air admission chamber and communicating. at one end with the gasolene chamber, said valve casingbemg formed with a port exposed to the air chamber, a plug mounted in said valve casing and formed with a plurality of vertical grooves establishing communication between that end of the valve casing which comml'micates with the gasolene chamber and said port, but otherwise cutting off one end of said -valve casing from the other end, an open-ended piston movable in said valve chamber and arranged to expose more or less of said. port to the grooves, a spring controlled air valve mounted in the main casing and arranged to open and close the said air admission ports, and a lever fulcrumed intermediate of its ends in the casing and operatively connected at its ends to said piston .and

valve.

8. The combination with a mixing chamber and a fuel, chamber, of a valve casing leading from the fuel chamber to the mix- I ing chamber and having a series of longitudinally-extending fuel channels closed atone end and opening toward the fuel chamber, the casing also havinga diagonally ar ranged slot upon its inner face intersecting said fuel channels and a tubular valve disposed within the valve-chamber and open at both ends, said "valve acting to cover or uncover a'greater or lessportion ofsaid slot as it is shifted to thereby "control the feed of fuel from the fuel chamber to the mixing chamber.

9. The combination with a mixing chamber and a fuel chamber, of a valve casing leading from the fuel chamber to the mixing longitudinally extending channels in its 'cii'cuinferencc,-said channels being open at the end of the plug directed toward the fuel chamber, said plug being formed with a diagonally arranged slot extending inward from its inner face and intersecting said channels, a tubular valve disposed within the plug and valve chamber, and means for shifting the valve to uncover a greater or less number of the said channels at the slotted opening thereof. i

'10. The combinationwith amixing chamber and a fuel chamber, of a tubular valve casing leading from the fuel chamber to the mixing chamber, said valve casing having a diagonal slot formed therein, an annular sleeve disposed within the valve casing and having a diagonal slot registering with the diagonal slot'in the casing, said plug being with the fuel chamber and having an air the fuel supply, and suction operated means inlet in its well, means for feeding fuel for shifting said valve. 10 from the fuel chamber to a point in the In testimony whereof I aflix my signature valve chamber immediately adjacent m the in presence of tWo Witnesses.

air inlet, a sliding open ended tubular valve WALTER F. SCHULZ. [11. s.] mounted in said valve chamber and vari- -Witnesses: ably opening and closing said air inlet to CARL F. ScHULz,

vary the air supply and coincidently Vary YVILLIAM COFFEY. 

